code: def test_basic_tokenizer_lower(self):
      tokenizer = BasicTokenizer(do_lower_case=True)
  
      self.assertListEqual(
          tokenizer.tokenize(" \tHeLLo!how  \n Are yoU?  "),
          ["hello", "!", "how", "are", "you", "?"],
      )
      self.assertListEqual(tokenizer.tokenize("H\u00E9llo"), ["hello"])
  
imports: import os
  import unittest
  from transformers import ElectraTokenizerFast
  from transformers.models.electra.tokenization_electra import VOCAB_FILES_NAMES, BasicTokenizer, ElectraTokenizer, WordpieceTokenizer, _is_control, _is_punctuation, _is_whitespace
  from transformers.testing_utils import require_tokenizers, slow
  from ...test_tokenization_common import TokenizerTesterMixin, filter_non_english
label_desc: Use image node_id 6 for calling the ElectraTokenizationTest obj's underlying member method code with example usage: obj.test_basic_tokenizer_lower() without return types